SDH :
" - "- , ;
" "- , - ADM (.9-7).
.9-7. 1+1
""- , ;
""- : 2 4 , () (" " " ", .9-8) / : "", 1+1 ( /, ) "", 1:1 ( - , .. 50 );
" " - 4/5/6- , ( ); SDH, . .9-9.
.. :
- - ( "-" "");
- ( SDH );
- , , ;
- (--) .
.3-2 , ( WDM) , - . "" . , , WDM, (, SD).
.3-2 . . - SDH - ADM, - SDH ISA SDH, - (/) IP ATM, - SD - SD AN. ( WDM) () - ADM ADM (OADM), - ISA DXC ( ISA ISA / : N13 SW () SW (). OADM 1 , GE/10GE FDDI, .
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OADM, : - (optical gateway). .. , - , - , " ".
SD , .9-10. M , .. .. . / , . , . ITU-T G.957.